| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for regulating the range in which recommendations are made to each user on a network. <P>SOLUTION: A server 10 receives user characteristic data from the terminals of a plurality of users via a communication network, and maps the characteristics of the plurality of users to a probability space according to the user characteristic data received. In the probability space to which the characteristics are mapped, the server calculates spherical distances between the users and, based on the spherical distances calculated, calculates attribute overlap index data indicating the degree of overlaps of attributes between the particular user among the plurality of users and the other users. About the attribute overlap index data calculated, the server calculates a nonlinear average that depends on a parameter indicating the user's degree of risk avoidance, thereby creating a recommendation list for making recommendations to the particular user. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
